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Allowance for Loan Losses - Allowance for Loan Losses and Recorded Investment in Loans by Portfolio Segment (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | --- | --- | --- | --- | ---
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total ending allowance balance | $ 17,956 | $ 18,305 | $ 17,820 | $ 17,798 | $ 17,071 | $ 16,394
Loans acquired with deteriorated credit quality | 3,661,151 |  | 3,004,957 |  |  |
Total ending loans balance | 8,198 |  |  | $ 8,358 |  |
Allowance for Loan Losses [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance For Loan Losses, Individually evaluated for impairment | 906 |  | 1,035 |  |  |
Allowance For Loan Losses, Collectively evaluated for impairment | 17,050 |  | 16,785 |  |  |
Total ending allowance balance | 17,956 |  | 17,820 |  |  |
Commercial [Member] | Allowance for Loan Losses [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance For Loan Losses, Individually evaluated for impairment | 906 |  | 1,035 |  |  |
Allowance For Loan Losses, Collectively evaluated for impairment | 11,176 |  | 9,460 |  |  |
Total ending allowance balance | 12,082 |  | 10,495 |  |  |
Real Estate [Member] | Allowance for Loan Losses [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance For Loan Losses, Collectively evaluated for impairment | 1,449 |  | 1,676 |  |  |
Total ending allowance balance | 1,449 |  | 1,676 |  |  |
Consumer [Member] | Allowance for Loan Losses [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance For Loan Losses, Collectively evaluated for impairment | 3,384 |  | 4,643 |  |  |
Total ending allowance balance | 3,384 |  | 4,643 |  |  |
Loans [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Loans: Individually evaluated for impairment | 8,194 |  | 6,695 |  |  |
Loans: Collectively evaluated for impairment | 3,657,149 |  | 3,005,858 |  |  |
Total ending loans balance | 3,665,343 |  | 3,012,553 |  |  |
Loans [Member] | Commercial [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Loans: Individually evaluated for impairment | 8,194 |  | 6,695 |  |  |
Loans: Collectively evaluated for impairment | 2,039,841 |  | 1,716,840 |  |  |
Total ending loans balance | 2,048,035 |  | 1,723,535 |  |  |
Loans [Member] | Real Estate [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Loans: Collectively evaluated for impairment | 796,485 |  | 668,124 |  |  |
Total ending loans balance | 796,485 |  | 668,124 |  |  |
Loans [Member] | Consumer [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Loans: Collectively evaluated for impairment | 665,192 |  | 546,774 |  |  |
Total ending loans balance | 665,192 |  | 546,774 |  |  |
Mortgage Warehousing [Member] | Allowance for Loan Losses [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance For Loan Losses, Collectively evaluated for impairment | 1,041 |  | 1,006 |  |  |
Total ending allowance balance | 1,041 |  | 1,006 |  |  |
Mortgage Warehousing [Member] | Loans [Member] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Loans: Collectively evaluated for impairment | 155,631 |  | 74,120 |  |  |
Total ending loans balance | $ 155,631 |  | $ 74,120 |  |  |

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- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 + Details
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- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The balance of financing receivables that were collectively evaluated for impairment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 + Details
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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=118939070&loc=d3e15032-111544 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707 + Details
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